Surf pi VS geotech baracuda

[K tech]

Which one do you guys like or prefer more? I want to build one of these and would love any suggestions. Also i am beginner and i dont own an oscilloscope so thats why i have these two in my list. Also let me know how do they compare with hammerhead in depth

[Toros]

Whatever someone tells you will always be different from the experience you will get from working with your detector. My advice is to make both detectors. They are not complicated to make. But for the coil you will need an oscilloscope to be able to choose the right damring resistor.

If you do not select the dumping resistors, the detector will work, but you will not have the maximum of its capabilities.

[K tech]

I can build one one now, so i will start with a surf pi probably and then the baracuda since i live in india and for the baracuda i need to source components from 3 different websites whereas i need to search only in two for the surf pi

[K tech]

I had one doubt and it would greatly help me if i get any help, can i subsitute the mpsa13 with bc517?

[6666]

The surf is a little bit easier to make because it uses a 4066 as the sample switch not fets as with the barra
the damping resistor needs to match the coil that you make, many ccts show a 390 ohm resistor this was for a coil of about 260uH
some ccts show a reverse parallel diode with the battery if you use that diode make sure you insert a fuse inline before the diode
instead wire it in series .

[K tech]

I see i wll think and decide since i need to get the components for both from 3 different websites lol i just found .

[6666]

I see i wll think and decide since i need to get the components for both from 3 different websites lol i just found .

Buy bulk mixed packs of R's and C's off ebay they are very handy for projects

[surfdetector]

I had one doubt and it would greatly help me if i get any help, can i subsitute the mpsa13 with bc517?

BC517 has a higher gain and the collector/emitter pin-out is opposite that of the MPSA113 so be careful when placing it on the pcb

[K tech]

BC517 has a higher gain and the collector/emitter pin-out is opposite that of the MPSA113 so be careful when placing it on the pcb

I will get a mpsa14 then, i think it will be better.

[K tech]

For the surf pi, all i can find is 10v max rated 7660. Will it serve the purpose or do i need something else

[surfdetector]

For the surf pi, all i can find is 10v max rated 7660. Will it serve the purpose or do i need something else

ICL7660SCPAZ is good for 12V max or an LT1054 if you can get one although they are more expensive

[Tibuck19]

I will get a mpsa14 then, i think it will be better.

KSP13TA is the more common replacement for the MPSA13 digikey part number KSP13TACT-ND

[K tech]

I am ready! i will be making baracuda. I have ordered pcb for it also can i use j112 instead of 2n5484 and 2n5485?

[Qiaozhi]

I am ready! i will be making baracuda. I have ordered pcb for it also can i use j112 instead of 2n5484 and 2n5485?

Make sure you're building the Geotech Baracuda, as there are errors in the other versions you may find floating around.
Geotech Baracuda - REV-A - Project Details

[K tech]

thanks qiazohi and yes i am building the rev A. Someone please tell me a subsitute for 2n5485